1. If you are not married, you generally don't need to accompany the gift, because you attended your cousin's wedding as a representative of your family, and you have already sent blessings and red envelopes as a family member.

If you are married, you can consider giving gifts, but it is not necessary. If your cousin is a very close friend of yours, or you played an important role in her growth, then giving gifts may be a way to express affection and friendship. However, if your cousin is not close, or you don't have much financial ability, it is ok not to follow the ceremony.

In a word, following the ceremony is a traditional custom, but it is not necessary. You should decide whether to follow the ceremony according to your actual situation and your relationship with your cousin.